VOA标准英语2012--New Heart Stents Better Than Old Ones, Study Says
时间：2018-12-16 作者：英语课 分类：VOA标准英语2012年(九月)
New Heart Stents Better Than Old Ones, Study Says
A heart stent is a mesh 1 tube made of metal that, when inserted into an artery 2, keeps it open.
Stents can be metal only or they can contain medicine released once the stent is in place.
These are called drug-eluting stents. And the medication they release helps the artery remain open so blood can easily flow through it.
But studies show that even with drug-eluting stents, some patients still have heart attacks. And earlier studies concluded that drug-eluting stents could actually increase the risk.
Dr. Stephan Windecker heads the interventional 3 cardiology program at Bern University Hospital in Switzerland. He organized a study on a new generation of drug-eluting stents and compared them to the plain metal variety.
“There were concerns that, actually, these drug-eluting stents may lead to adverse 4 events such as occlusion [closing] of the artery with blood clots," said Windecker.
Dr. Windecker and other researchers studied more than 1,000 heart patients who were having an emergency heart procedure. About half received a bare-metal stent while the rest received the latest medicated stent. The medicine was on a biodegradable substance.
“That is a polymer which degrades into water and carbon dioxide during a period of six to nine months after the drug has been released and renders the stent surface more closely to a bare-metal stent," he said.
A year later, the researchers found those who got the drug-eluting stent had fewer heart problems than those who received the bare-metal variety.
“The occurrence of new heart attacks within that treated segment was slower with the biodegradable polymer as compared to the bare-metal stent, and it reduces the incidences of serious cardiovascular events by more than 50 percent," said Windecker.
Dr. Windecker says these newest drug-eluting stents made with polymers that dissolve are better than other medicated stents made with polymers that don't dissolve.
Ideally, a layer of cells that lines the artery will grow over the stent, making it, in a sense, part of the body.
The study was published in the Journal of the American Medical Association.
- Their characters just don't mesh.他们的性格就是合不来。
- This is the net having half inch mesh.这是有半英寸网眼的网。
- We couldn't feel the changes in the blood pressure within the artery.我们无法感觉到动脉血管内血压的变化。
- The aorta is the largest artery in the body.主动脉是人体中的最大动脉。
- AM Contrast Nephropathy: What the Interventional Cardiologist Should Know and Do? 对比剂肾病：介入医师必须想到的和做到的是什么？ 来自互联网
- This article reviews some progresses in interventional therapy of liver cancer. 本文就肝癌介入治疗方面的研究进展简要综述。 来自互联网